We look at the division of 18405 by 89 
The aim is to understand the frequency of 89 in 18405.

Going ahead to step 1:
89 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 89

Let's proceed to step 2:
If we divide 18 by 89, we get 0 and a remainder of 18.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Grab the next digit (4) from the dividend, add it to 18, then carry on: 184 / 89

On to step 3:
89 goes into 184 2 times with a remainder of 6.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 178 from 184 leaves us with 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 89

Step 4:
89 goes into 60 0 times with a remainder of 60.
The next digit of our result is 0. 
Result so far: 20.0
If we subtract 0 from 60, we get 60.
Append the next digit (5) from the dividend to 60 and continue with: 605 / 89

Step 5:
605 divided by 89 is 6 with a remainder of 71.
The number 6 becomes the next digit in our result. 
Result so far: 206.0
Subtract 534 from 605 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 6:
When dividing 710 by 89, we get 7 with a remainder of 87.
The next digit of our result is 7. 
Result so far: 206.7
Subtract 623 from 710 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Let's proceed to step 7:
89 can be fit into 870 9 times, resulting in a remainder of 69.
Record the quotient 9 as the next digit in the result. 
Result so far: 206.79
If we subtract 801 from 870, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 8:
690 divided by 89 is 7 with a remainder of 67.
The next digit of our result is 7. 
Result so far: 206.797
Subtract 623 from 690 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Step 9:
If we divide 670 by 89, we get 7 and a remainder of 47.
Use 7 as the next digit of our solution. 
Result so far: 206.7977
Subtracting 623 from 670 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

The final result is 206.7977 with a remainder of 0.00047.